Pioneer PDR-04 - Manual (Page 48)

PDR-04
i Notes
(1 ) Use a 10 : 1 probe for the oscilloscope.
(2) All the knob positions (settings) for the oscilloscope In the adjustment procedures are for when a 10 :1 probe is used.
• Test Mode
This model has a test mode so that the adjustments and checks required for service can be carried out easily.
When this model is in test mode, the keys on the front panel work differently from normal. Adjustments and checks can be
carried out by operating these keys with the correct procedure. For this model, all adjustments are carried out in test
mode.
[ Setting to Test Mode ]
Howto set this model into test mode.
(1 ) Unplug the power cord from the AC socket.
(2) Short the test mode short land. (See Fig. 1.)
(3) Plug the power cord back into the AC socket.
When the test mode is set correctly, the display is different from what it usually is when the power is turned on. (lights up
all FL display) If the display is still the same as usual, test mode has not been set correctly, so repeat Steps 1 - 3.
[ Release from Test Mode ]
Here is the procedure for releasing the test mode.
(1 ) Press the STOP key and stop all operations.
(2) Unplug the power cord from the AC socket.
[ Operations of the Keys in Test Mode ]
Code Key Name Function In Test Mode Explanation
DIGITAL
SYNCHRO
Playback laser diode ON Lights up the laser diode by playback power.
FINALIZE Focus servo closes
The laser diode is lit up and the focus acutuator Is lowered,
then raised slowly and the focus servo is closed at the point
where the objective lens is focused on the disc.
With the player in this state, if you lightly rotate the stopped
disc by hand, you can here the sound the focus servo. If you
can hear this sound, the focus servo is operating correctly.
If you press this key with no disc mounted, the laser diode
lights up, the focus acutuator is pulled down, then the
acutuator is raised and lowered three times and returned to
its original position.
► PLAY Spindle servo ON
Starts the spindle motor in the clockwise direction and when
the disc rotation reaches the prescribed speed (about 500
rpm at the inner periphery), sets the spindle servo in a
closed loop.
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